/*
 * Created on 12-Jul-2004
 * Created by Paul Gardner
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

package org.gudy.azureus2.core3.util;

/**
 * @author parg
 */
public class
SimpleTimer {
    /**
     * A simple timer class for use by application components that want to schedule
     * low-overhead events (i.e. when fired the event shouldn't take significant processing
     * time as there is a limited thread pool to service it
     */
    private static final Timer timer;
    private static final CopyOnWriteList<TimerTickReceiver> tick_receivers = new CopyOnWriteList<>(true);

    static {
        timer = new Timer("Simple Timer", 32);
        timer.setWarnWhenFull();
        addPeriodicEvent(
                "SimpleTimer:ticker",
                1000,
                new TimerEventPerformer() {
                    private int tick_count;

                    public void
                    perform(
                            TimerEvent event) {
                        tick_count++;
                        if (tick_receivers.size() > 0) {
                            long mono_now = SystemTime.getMonotonousTime();
                            for (TimerTickReceiver ttr : tick_receivers) {
                                try {
                                    ttr.tick(mono_now, tick_count);
                                } catch (Throwable e) {
                                    e.printStackTrace();
                                }
                            }
                        }
                    }
                });
    }

    public static void
    addEvent(
            String name,
            long when,
            TimerEventPerformer performer) {
        timer.addEvent(name, when, performer);
    }

    static void
    addPeriodicEvent(
            String name,
            long frequency,
            TimerEventPerformer performer) {
        timer.addPeriodicEvent(name, frequency, performer);
    }

    interface
    TimerTickReceiver {
        void
        tick(
                long mono_now,
                int tick_ount);
    }
}
